BMW 325 SE

THIS IS THE FIRST BMW I HAVE HAD I ALL WAYS HAVE HAD FORDS ANY WAY I NEED SOME HELP WITH THIS 1 ..I DROVE THE CAR TO MY FRONT DOOR THE OTHER NIGHT GOT OUT OF IT BUT NEVER P[UT THE ALARM ON 15 MIN LATER I WENT OUT AND IT WOULD NOT START ALL THE DASH LIGHTS COME ON BUT NO POWER TO THE STARTER MY KEY FOB OPENS THE DOOR STILL AND TURNS THE ALARM OFF AND ON AND ALL SO IT STILL OPENS THE WINDOWS BUT IS DEAD WHEN I TAKE IT ALL THE WAY TO THE IGNITION THERE IS NOWT ONLY THE LIGHTS ANY HELP WITH THIS 1 WOULD BE GREAT THANKS IN ADVANCE ...HUMAX